naqtn
If the Unity project settings
Reload Domain
is disabled, ClientSim doesn't properly handle Player Objects, causing exceptions and stopping work.
Repro
  1. Start Unity. Create a scene. Add
    VRCPlayerObject
    component(s).
  2. Enable
    Play Mode Options
    and disable
    Reload Domain
    (via Unity menu > Edit > Project Settings > Editor > Enter Play Mode Settings)
  3. Press the Play button to start ClientSim (it will work normally at the first launch). And exit play mode.
  4. Press the Play button again. Then,
    MissingReferenceException
    occurs (see attached). And it doesn't work correctly anymore.
Version
World SDK 3.7.5
Analysis
Clientsim caches the Player Objects in
ClientSimNetworkingUtilities._playerObjectList
. And it depends on the reloading to initialize it. It should be initialized when starting the simulation.
Snipping from the log for searching
MissingReferenceException: The object of type 'VRCPlayerObject' has been destroyed but you are still trying to access it.
Your script should either check if it is null or you should not destroy the object.
VRC.SDK3.ClientSim.ClientSimPlayer.SetupPlayerPersistence (VRC.SDK3.ClientSim.IClientSimEventDispatcher eventDispatcher, VRC.SDK3.ClientSim.IClientSimUdonEventSender udonEventSender, VRC.SDK3.ClientSim.IClientSimBlacklistManager blacklistManager, VRC.SDK3.ClientSim.IClientSimUdonManager udonManager, VRC.SDK3.ClientSim.IClientSimSyncedObjectManager syncedObjectManager, VRC.SDK3.ClientSim.IClientSimPlayerManager playerManager) (at ./Packages/com.vrchat.worlds/Integrations/ClientSim/Runtime/Player/ClientSimPlayer.cs:198)